Bit sharpener



Sept. 21, 1954 Filed Dec. 18, 1952 L. BREDESEN BIT SHARPENER 2Sheets-Sheet 2 M INVENTOR.

Leo firedese/z,

Patented Sept. 21, 1954 UNITED STATES PATENT OFFICE BIT SHARPENER LeoBredesen, Greenwood, Wis.

Application December 18, 1952, Serial No. 326,651

3 Claims. 1

This invention relates to a bit or drill sharpener, and moreparticularly to a bit sharpener for attachment to a drilling machine.

The object of the invention is to provide a bit sharpener which can bereadily attached to a drilling machine so that the sharpening of bitscan be accomplished faster and more efiiciently.

Another object of the invention is to provide a bit sharpener which willenable the operator to sharpen the bits more efficiently andeffectively, the bit sharpener of the present invention including aframe and a vertically movable hammer which drops by gravity to sharpenthe bit.

ent during the course of the following description.

In the accompanying drawings, forming a part A of this application, andin which like numerals are used to designate like parts throughout thesame:

Figure 1 is a side elevational view of the bit sharpener of the presentinvention, with parts broken away and in section.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional view takenon the line 3--3 of Figure 1.

Figure 4 is a sectionalview taken on the line 4-4 of Figure 2.

Figure 5 is a sectional view taken on the line 5-5 of Figure 3.

Figure 61s a horizontal sectional view through the bit showing thespring clip being used.

Figure 7 is a plan view showing the working face of the hammer.

- Figure 8 is a plan view of the bit.

Figure 9 is a fragmentary elevational view showing the lower portion ofthe hammer.

Figure 10 is a fragmentary elevational view showing the bit, and withparts broken away and in section.

Figure 11 is a modified side elevational view of the hammer, with partsbroken away and in section.

Figure 12 is a plan view of the assembly shown in Figure 11. I

'Referring in detail tothe drawings, the numeral I0 designates a framewhich may be fabricated of any suitable material such as metal, and theframe [0 includes a plurality of vertically disposed spaced angle ironsor beams ll, I2, I4 and [5, Figures 1, 2 and 3. Arranged below the thetraveling hammer 2G.

frame i0 is a horizontally disposed base l6, and

pivotally connected to the base I6 by means of a pin it is a housing l1.provided with a tapered socket I9 for snugly receiving therein a taperedcasing 20.

The casing is provided with a threaded bore 2| for receiving therein thethreaded end 23 of the bit 22 which is to be sharpened.

The numeral 24 designates the teeth on the working face of the bit 22,Figure 8, and the bit 22 may also be provided with a pair ofdiametrically opposed grooves or cut-outs 25 for a purpose to be laterdescribed. Movably mounted above the bit 22 is a vertically movablehammer 26. The hammer 2B is adapted to drop by gravity to sharpen theteeth 24 of the bit 22, and the hammer 26 includes a pair of opposedtongues 28 which are adapted to extend into the grooves 25 to properlyalign the hammer 26 with the bit 22. The working or lower face of thehammer 26 is further provided with a plurality of spaced teeth 29 whichserve to sharpen the: teeth 24 of the bit 22 when the hammer reaches thebottom of its drop.

Mounted on the upper portion of the bit 22 is a sleeve 3! which helpsform aguideway for A jacket 32 is arranged above the sleeve 3I, andsuitable pins 30 extend through the jacket 32 and into slots 21 whichare formed in the hammer 26, the pins 30 cooperating with the slots 21to prevent the hammer 26 from rotating or moving out of its properaligned position with respect to the bit 22. The upper end of the hammeris provided with an opening or aperture 33 whereby a suitable cord orcable which may be connected to a pulley can be used for raising thehammer 26 after the hammer has dropped by gravity to sharpen the bit 22.

For use in pivoting or moving the bit 22 from a horizontal position tothe position shown in Fig ure 1, a spring clip 35 is provided, thespring clip 35 including a pair of opposed fingers 34 which are adaptedto snugly seat within the grooves 25 of the bit 22. A rod or handle 36has one end connected to the spring clip 35, Figure 6, and a screw 39,and a handle 40 is connected to the The housing I! is outer end of thescrew 39. Thus, by manually rotating the handle 40 the block 38 can bemoved from left to right or vice versa, Figure 3, whereby the block orstop member 38 can be positioned as desired. Cooperating with the stopmember 33 is a clamp which includes a: clamping bar 4|, and the clampand block or stop member 38 serve to maintain the bit 22 immobile in itsadjusted position. The bar 4| of the clamp is pivotally connected to theframe by means of a pin 42, and a clamping bracket A3 is arranged inengage-- ment with the other end of the bar 4!, there being a manuallyoperable screw member Mi for locking the bar M into the clamping bracket43;

Extending from the frame H] are support members 45 which are providedwith suitable openings 46 whereby securing elements such as bolt and nutassemblies can be extended through the openings 46 into engagement witha suitable supporting structure such as a drilling machine.

Extending between the beams l2 and i l and secured. thereto is ahorizontally disposed bar or cross piece 58, there being a similar bar49' extending between the beams I- I: and i5- and secured thereto. Thebars as and 49 are arranged in pairs one above the other, there beingtwo of the bars 48' and two of the bars 59. Movably mounted within theframe to is a pair of horizontally disposed arms ll, the arms 41extending between the bars 48 and 4+) and adjustably connected thereto.A plate 5% is secured to the upper surface of each of the arms l! bysuit able securing elements such as screws or bolts 5 l, and the plates59 are secured to the jacket 32 which slidably houses the hammer 26.Thus, upon movement of the arms 41 the position of the jacket. 32 andhammer 2t can be regulated or adjusted to properly align the hammer 28with the bit 22 below. For finally adjusting the arms 41 andconsequently the hammer 26, a pair of screw members 52 are operativelyconnected to each of the arms A7. A handle 53 is provided on the outerend of the screw member 52- for rotating the latter, and arranged inthreaded engagement with each of the screw members 52 is a nut 54 havinga body portion 55-. A pin or bolt 9 is secured to each ofv the nuts- 54,inany suitable manner, as for example: by welding, and the arms 47 arepivotally mounted on the bolts 9, there being. securing elements 8- formaintaining the arms 4?. pivotal'ly connected to the bolts 9-.

Referring to Figures 11 and? 12', there is shown a modified hammerassembly whereby the ham-.- mer is indicated by the numeral 56;. thehammer 56 adapted to drop by gravity int the same mane ner as thepreviously described hammer 26. The hammer 56 includes a lower threaded:portion 51' which is arranged in threaded engagement with a. collar 58;the bottom of the collar SS being open and provided with a tapered seat59 which is adapted to cooperate with the bit 2d: to help align thehammer and bit. Teeth 6''! are arranged in the lower surface of the"hammer 56 for sharpening the teeth on the bit,.and tongues 60 arearranged on the lower-end of the hammer 56- for seating inthe grooves 25to maintain the hammer and bit in their proper aligned rela'. tion..

In use, the housing I! may be pivoted to" a horizontal position aboutthe-pin l-8-,itheclampingbracket 43 having first been disengaged. Then,

the end 23 ofthe bit 22- can bearranged in threaded engagement? with.the bore 21-. the spring: clip- 35 is arranged in engagement with thebit 22 and the hand-grip 31 is manipulated in order to pull or lift thebit from its horizbntal position to the raised position shown inFigure 1. Then, the bar 4| can be clamped to maintain the bit 22immobile, and the stop block 38 can be adjusted or positioned to preventaccidental shifting of the bit 22. The hammer 26 can be raised by meansof a cable which can be engaged in the opening 33, and when tension onthe cable or hammer 25' is released, the hammer 26' Will drop by gravityso that the teeth 29 of the hammer 26 will sharpen the teeth 24 of thebit 22. This cycle of operation is repeated whereby the hammer can bealternately lifted and permitted to drop by gravity in order to sharpenthe teeth ofthe bit. The screw members 52 can be rotated by means of thehandles 53 in order to properly align the hammer 26 With the bit 22therebelow.

The present invention can be attached to a drilling machine by means ofbolts passing through the openings 45- inthe support members 45. Withthe present invention attached to a drilling machine a large number ofbits can be conveniently sharpened. The bit sharpener of the presentinvention is very useful and will facilitate the sharpening of bits bypersons in the trade. Also, when the bit sharpener of the presentinvention is attached to a machine, the sale of such machine will befacilitated. The bit sharpener of the present invention can be readilyattached to a drilling machine and will make the machine more valuable.Thus, a drilling machine with the attachment of the present inventioncan beset up in a shop or can be takento the job whereby a great numberof bits bequickly sharpened with ease and efficiency. Also, bits besharpened during the drilling opfera tions and the sharpening will bemore eflicient than if it was done by hand. Furthermore, the sharpenerincludes a gravity drop which is the natural way for a heavy hammer tooperatesmoothly. Adjustments are provided so that-the hammer can bealigned with the various partsiof the device.- Also; the bit can besharpened anda means is provided for 1 ting the bit and ham; mer totheirproper positions.

I claim:

1-. A bit sharpener comprising. a frame,- a base arranged below saidframe, a housing pivotally' connected-t0- said base and provided with atapered socket, a casing seated in said socket and provided athreadedbore for receiving therein the threaded end of a bitto-besliarpened, there beinga pair of opposed grooves in said bit to besharpenedaa ,cl-iparranged in engagesmentwithsaidbit: for aligning saidbit, a handle having one end connected to said spring clip for manuallymowing the bit, aclampf for maintaining said bit immobile in itsadjusted position, and a hammer mounted for vertical mover?" ment abovesaid bit and: provided with teeth thereon, there being tongues in saidhammer for seating in the grooves in said bit.

2.. The apparatus. asidesc'ribed in claim 1, and further includingmeans:for guiding said ham?- mer during its movement and means for adiusts'ing. the position of the hammer in said frame;

3. In a bit sharpener, a frame including 9)- plurality ofverticallydisposed-- beams. a horizontally disposed base arranged-below saidframe,

a housing pivotally connected tosaid base and provided with a taperedsocket for receiving: therein a' casing; there beinga threaded boreinsaidcasing for receiving a bit to be" sharp;

mer slidably mounted in said Jacket, the lower working face of saidhammer being provided with a plurality of spaced teeth, said housingfurther including a pair of opposed tongues on its lower end, therebeing an aperture in the upper end of said hammer to be engaged by alifting line, a spring clip for engaging the bit to be sharpened andincluding a pair of opposed fingers, a rod having one end connected tosaid spring clip, a hand grip mounted on the other end of said springclip, a stop member for maintaining the bit immobile in its adjustedpositions, a screwconnected to said stop member, a handle connected tothe outer end of said screw, a clamp cooperating with said screw memberand including a clamping bar having one end pivotally connected to saidframe, a bracket arranged in engagement with the other end of saidclamping bar, a manually operable screw for locking said clamping bar insaid bracket, support members extending from said frame for attachmentto a supporting structure, crosspieces supported by said frame, a pairof horizontally disposed arms movably mounted within said frame andadjustably connected to said crosspieces, a plate secured to the uppersurface of each of said arms, and said plates being secured to saidjacket, and a pair of screw members for adjusting said arms.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 902,146 Gilson Oct. 27, 1908 996,807 Smyth July 4, 19111,461,011 Halleck July 3, 1923 1,531,491 Macready et al. Mar. 31, 19251,870,723 Friedman Aug. 9, 1932 1,875,586 Friedman Sept. 6, 19322,443,814 Curtis June 22, 1948 2,450,621 Wineman Oct. 5, 1948 2,645,138Mitchhart July 14, 1953 FOREIGN PATENTS Number Country Date 3,983 GreatBritain Feb. 23, 1893

